Study on Operation Simulation of Hydraulic Pumps Turbines by discrete-vortex-elements LES model

离散涡元LES模型水轮机运行仿真研究

基本信息

批准号：
15560132
负责人：
KAMEMOTO Kyoji
金额：
$ 2.37万
依托单位：
National University Corporation Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

The purpose of this research project is to develop a turbulence model for a vortex element method and realize the virtual reality simulation of the operating state of turbo machinery.Firstly, in order to construct a new Lagrangian Large Eddy Simulation(LES) model, a vortex element redistribution model was proposed and introduced into a vortex method, which has been developed by the head investigator's group. The model was applied into a collision of two vortex rings in order to examine its validity. According to the results, complex and unsteady deformation of vorticity regions and the energy cascade mechanism were reasonably simulated using the proposed model. Furthermore, the analyzed energy spectra were in good agreement with the existing experimental data.Secondly, in order to examine the applicability of the Lagrangian LES model to the turbo machinery, simulation of three-dimensional, unsteady and complex flows through a mixed-flow pump including impeller-vanes, diffuser-vanes, and guide-vane, were carried out for three operating conditions : the design point, an off-design point and a shut-off point. The fluid forces, pressure fluctuation, and pump efficiency were calculated. The predicted characteristics of the pump reasonably agreed with the experimental ones. Through the calculation, the applicability and validity of the vortex method for analysis off low through a mixed-flow pump were confirmed.Finally, the interactive features of two-dimensional, unsteady, and complex flows through a model pump-turbine including stay-vanes, guide-vanes, and a runner were calculated and the applicability of the Lagrangian LES model was confirmed.From these results, it was revealed that the vortex method including the proposed Lagrangian LES model is a powerful tool for simulation of operation of various turbo machinery.

该研究项目的目的是为涡流元素方法开发湍流模型，并实现对涡轮机械运行状态的虚拟现实模拟。首先，为了构建一个新的拉格朗日大型涡流模拟（LES）模型，提出了一个涡流元件重新分配模型，并引入了由涡流进行了涡流研究，该模型已通过直接的研究效应了。将模型应用于两个涡旋环的碰撞中，以检查其有效性。根据结果，使用所提出的模型合理地模拟了涡度区域的复杂和不稳定变形和能量级联机制。 Furthermore, the analyzed energy spectra were in good agreement with the existing experimental data.Secondly, in order to examine the applicability of the Lagrangian LES model to the turbo machinery, simulation of three-dimensional, unsteady and complex flows through a mixed-flow pump including impeller-vanes, diffuser-vanes, and guide-vane, were carried out for three operating conditions : the design point, an off-design点和关闭点。计算流体力，压力波动和泵效率。泵的预测特征与实验性的特征合理地达成了一致。 Through the calculation, the applicability and validity of the vortex method for analysis off low through a mixed-flow pump were confirmed.Finally, the interactive features of two-dimensional, unsteady, and complex flows through a model pump-turbine including stay-vanes, guide-vanes, and a runner were calculated and the applicability of the Lagrangian LES model was confirmed.From these results, it was revealed that the vortex method including the拟议的Lagrangian LES模型是模拟各种涡轮机械操作的强大工具。